The first time I grew amaranth microgreens at Wholly Water Farms, I almost gave up on them. The seeds are comically tiny — like fine sand — and they blew off the tray the moment I set up my fan. Half the tray damped off three days after germination. The ones that survived took what felt like forever compared to my sunflower and radish trays. But when that first successful batch finally filled out, the deep magenta and crimson color stopped me in my tracks. Nothing else in the grow room looks like amaranth.

I have grown them consistently since then, and they have become one of our most requested specialty varieties. Chefs want them for visual impact. Health-conscious customers want them for the nutrition profile. And I grow them because they connect modern microgreens to one of the oldest cultivated food plants on earth.

What Is the History of Amaranth as a Food Crop?

Amaranth cultivation dates back at least 6,000 to 8,000 years in Mesoamerica, making it one of the oldest food plants in the Western Hemisphere. Archaeological evidence from the Tehuacan Valley caves in Puebla, Mexico, confirms its presence in early agricultural communities long before the Aztec empire rose. But it was the Aztecs who elevated amaranth to a staple on par with maize and beans. They called it huauhtli, and the capital city of Tenochtitlan received an estimated 20,000 tons of amaranth annually as tribute from conquered provinces.

Amaranth held both nutritional and spiritual significance. During festivals honoring the war god Huitzilopochtli, priests mixed amaranth flour with honey to form ceremonial dough called tzoalli. When Spanish conquistadors arrived and sought to dismantle Aztec religion, they banned amaranth cultivation — one of history's more dramatic examples of a crop being suppressed for political rather than agricultural reasons. The ban pushed amaranth to the margins of food production for centuries, though small-scale cultivation survived in remote regions of Mexico, Central America, and later spread to parts of Asia and Africa.

Today, amaranth is experiencing a global resurgence as interest in ancient grains, complete plant proteins, and nutrient-dense foods grows. The microgreen version captures much of what makes this plant remarkable in a format that is ready in under two weeks.

What Makes Amaranth Microgreens Nutritionally Unique?

The standout feature is protein quality. Amaranth is one of the few plant foods that provides all nine essential amino acids in proportions that meet human dietary requirements — a distinction it shares with quinoa and soy but that is rare among leafy greens. Particularly notable is its lysine content, an amino acid that is the limiting factor in most grain-based diets. This makes amaranth microgreens a valuable addition for anyone relying on plant-based protein sources.

Beyond protein, amaranth microgreens deliver meaningful mineral content. Amaranth leaves provide approximately 215 milligrams of calcium per 100 grams — higher than spinach at 99 milligrams and kale at 150 milligrams — with relatively lower oxalate content than spinach, meaning the calcium is more bioavailable. Iron content is approximately 2.3 milligrams per 100 grams, and here is the elegant part: amaranth also contains roughly 43 milligrams of vitamin C per 100 grams. Since vitamin C dramatically enhances non-heme iron absorption, the plant essentially packages iron alongside its own absorption enhancer.

The anthocyanin pigments responsible for amaranth's vivid red and magenta color add their own layer of nutritional interest. These water-soluble flavonoids have demonstrated cardiovascular and anti-inflammatory properties in clinical research. A single ounce of red amaranth microgreens delivers color compounds, complete protein, calcium, iron, and vitamin C in a package that takes up less space on your plate than a business card.

How Do You Grow Amaranth Microgreens?

Growing amaranth microgreens requires adjusting your technique if you are accustomed to larger-seeded varieties like sunflower or pea. The seeds are extremely small — roughly 1 millimeter in diameter, which is 1/8 the size of a radish seed. This tiny size creates several unique challenges and requires a modified approach.

Seed preparation: Do not soak amaranth seeds. They are too small and will clump into a paste. Use them dry, straight from the bag.

Seeding density: Use approximately 1 to 1.5 tablespoons of seed per standard 10x20 tray. Sprinkle seeds as evenly as possible across moistened growing medium. The small size makes even distribution difficult — I use a fine mesh shaker (a repurposed spice container with small holes works well) to spread seeds more uniformly. Do not bury the seeds. Amaranth needs light to germinate, so at most press them gently into the surface or cover with the thinnest possible layer of fine vermiculite.

Germination: Amaranth germinates slower than most microgreen varieties. Expect 2 to 4 days for initial germination at temperatures of 70 to 80 degrees Fahrenheit. Cooler temperatures will extend this considerably — below 65 degrees, germination can stall entirely. I keep my amaranth trays on the warmest shelf of my growing rack, and during cooler months I use a seedling heat mat underneath.

Blackout period: Use a light blackout dome or inverted tray for the first 3 to 4 days. Unlike heavier-seeded microgreens, do not place a weighted tray on top — the fragile amaranth seedlings cannot push through pressure the way sunflower or radish can.

Growing: Once seedlings emerge and show color, move them under grow lights running 12 to 16 hours daily. Amaranth responds strongly to light with increased pigmentation — the more light they receive, the deeper and more vivid the magenta and red tones become. Water from below by bottom-watering the tray. Top watering with any force will flatten these delicate seedlings and create conditions for damping off.

Harvest: Amaranth microgreens are typically ready 8 to 12 days after seeding, though some growers let them go to 14 days for slightly larger greens. Harvest when the first true leaves are just beginning to emerge above the cotyledons. The stems should be 2 to 3 inches tall with well-developed color. Cut just above the soil line with sharp, clean scissors or a knife.

What Are the Common Problems When Growing Amaranth Microgreens?

Amaranth is not a beginner microgreen. I recommend getting comfortable with at least three or four other varieties before attempting it. The common problems are predictable but require attention:

Damping off: This fungal disease kills seedlings at the soil line, causing them to topple over with a characteristic pinched, water-soaked stem base. Amaranth is particularly susceptible because of its fine stems and the moisture levels needed for germination. Prevention is everything — ensure good airflow with a gentle fan, water from below only, use clean trays and fresh growing medium, and avoid overwatering. If you see damping off in one area of a tray, you cannot save those seedlings, but improving airflow may protect the rest.

Uneven germination: The tiny seeds tend to clump during sowing, creating dense patches next to bare spots. Use the shaker method and take your time distributing seeds. Some growers mix amaranth seed with fine sand at a 1:3 ratio to improve spacing — the sand acts as a carrier that helps the seeds spread more evenly.

Seeds blowing around: Any air movement during sowing will scatter these lightweight seeds off the tray and across the room. Turn off fans before sowing, mist the growing medium surface so seeds stick on contact, and work in a calm area. I learned this the hard way when I lost half a tray's worth of expensive organic amaranth seed to a well-timed HVAC vent.

Slow growth: Amaranth is simply slower than radish (4 to 6 days) or sunflower (7 to 10 days). Plan your production schedule accordingly. If you are growing for sale, you need to seed amaranth trays several days before other varieties to have everything ready for the same harvest date.

How Do Amaranth Microgreens Compare to Other Colored Varieties?

Several microgreen varieties compete in the "dramatic color" category that chefs and home growers value for visual impact. Here is how amaranth stacks up:

Variety	Color	Days to Harvest	Difficulty	Flavor
Red Amaranth	Deep magenta/crimson	8-12	Moderate-Hard	Mild, earthy, slightly sweet
Red Cabbage	Purple stems, green leaves	6-10	Easy	Mild brassica, slightly peppery
Purple Radish	Purple-red stems	5-7	Easy	Spicy, peppery
Red Sorrel	Red-veined green leaves	10-14	Moderate	Tart, lemony
Bull's Blood Beet	Deep burgundy	8-12	Easy-Moderate	Earthy, sweet

Amaranth stands alone for the intensity and purity of its magenta color. Red cabbage offers purple stems but green cotyledons. Purple radish fades quickly after cutting. Beet microgreens are beautiful but earthier in flavor. Amaranth delivers that electric, almost neon magenta that no other variety matches, with a flavor mild enough that it does not overpower delicate dishes.

For chefs, a pinch of amaranth microgreens transforms a plate. For growers like me, the challenge of producing them consistently is part of the satisfaction. And for anyone interested in food history, each tray connects us to an 8,000-year agricultural tradition that nearly vanished but is finding its way back. If you want to explore more microgreen varieties and growing techniques, start with the easier ones and work your way up to amaranth. It will test your patience, but the results are worth it.

Frequently Asked Questions

What does amaranth microgreen taste like?

Amaranth microgreens have a mild, earthy flavor with a slightly sweet, beet-like undertone. They are far less assertive than radish or mustard microgreens, which makes them versatile in the kitchen. The mildness is actually an advantage for garnishing because amaranth adds stunning visual impact without competing with the primary flavors of a dish. They work well in salads, on sandwiches, as garnish for soups, and in smoothies.

Do you need to soak amaranth seeds before planting as microgreens?

No. Do not soak amaranth seeds. They are approximately 1 millimeter in diameter, and soaking causes them to clump into an unworkable paste that is impossible to spread evenly. Sow them dry onto a pre-moistened growing medium. The moisture in the soil provides sufficient hydration for germination without the clumping problems that soaking creates. This is the opposite of large-seeded microgreens like sunflower and pea, which benefit from pre-soaking.

How do you prevent damping off in amaranth microgreens?

Damping off prevention starts with airflow. Run a gentle fan near your trays from the moment seedlings emerge. Water exclusively from the bottom to keep stems and leaves dry. Use fresh, clean growing medium and sanitized trays for every batch. Avoid overwatering — the soil should be moist but never waterlogged. If growing in a humid environment like Florida, maintaining air circulation is even more critical. Remove any affected seedlings immediately to prevent spread.

Are amaranth microgreens a complete protein?

Yes. Amaranth is one of the few plant foods that contains all nine essential amino acids in proportions that meet human dietary requirements. This complete protein profile extends to the microgreen stage. Amaranth is particularly high in lysine, an amino acid that is often the limiting factor in grain-based diets. While the total protein content per serving of microgreens is modest due to the small serving size, the quality of that protein is unusually high for a plant food.